Comparison of Superacid-Catalyzed Depolymerization and Thermal Depolymerization of Bituminous Coal-Catalysis by Superacid HF/BF_3 and Synthetic Pyrite

摘要

Depolymerization of bituminous coal by conventional thermal reaction, both with and without a synthetic pyrite catalyst, and a superacid-catalyzed reaction using a mixture of hydrogen fluoride and boron trifluoride were examined to study differences between radial and ionic reactions in coal depolymerization. All reactions took place under hydrogen without any solvent. Depolym- erization of bituminuous Miike coal was comparatively homogeneous following the superacid- catalyzed reaction with HF/BF_3, but was heterogenoues following the thermal reaction using the synthetic pyrite catalyst.